Reflector for street-lamps



(No Model.)

E. S. RITCHIE.

REFLECTOR FOR STREET LAMPS; No. 270,339. Patented Jan. 9,1883.

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lhvrren STATES ATENT Fries.

EDWARD S. RITCHIE, OF BROOKLINE, MASSACHUSETTS.

REFLECTOR FDR STREET LAMPS.

SPECIFICATION forming part of Letters Patent No. 270,339, dated January9, 1883.

(No model.)

T all whom it may concern:

Be it known that I, EDWARD SAMUEL RITCHIE, of Brookline, in the countyof Norfolk, of the State of Massachusetts, have invented a new anduseful Improvement in Reflectors for Street-Lamps; and I do herebydeclare the same to be described in the following specification andrepresented in the'accompanying drawings, of which- Figure l is a topview, Fig. 2 a bottom view, Fig. 3 an end view, and Figs. 4 and 5cross-sections in planes at right angles to iach other, of a reflectorembodying my invention.

This reflector at its central part has an opening, a, extending throughit to receive the chimney of a lamp when the reflector is used with alamp, or to allow the smoke of a gas-flame to pass upward through suchrcflector when it is used with such a burner.

It is customary to have a reflector provided with concave surfaces toreceive light from a flame, and to reflect in condensed or diagonalbeams the rays thereof in nearly opposite directions directly upon astreet, and by concave surfaces to reflect the rays nearly verticallydownward upon a plane mirror to be again reflected upon the street.

The usual forms for direct reflection are shown in the drawings at A andB, as arranged on opposite sides of the opening a, eachreflecn'ig-surt'ace being arched or an ellipsoidal segment of truncatedcone or'an approximate thereto.

In front of the opening a, and between the .two curved and taperingreflecting-surfaces A. and B, is a flat or plane reflecting-surface, C,which is horizontal, or may be very slightly inclined either upward ordownward. increases in width as it extends from the opening a. Thisreflecting-surface U is designed to illuminate the street in front andfor an angular space of about ninety degrees in front of the lamp; butthere would be spaces on the street between the portionsilluminated bythe reflecting-surface O and that which can receive rays from thelateral Icflectors A and B. I place in rear of the opening a, and fortheillumination of these spaces, and between the two lateralreflecting-surfaces A and 13, two plane reflecting-surfaces,

|,D E, arranged at an obtuse angle with each other, and each inclineddownward, in manner as represented.

Each of the two rear reflectors may be made in two or more planes.slightly inclined to each other, in order to disperse the rays over awiderspace than-a single plane reflector would do.

A reflector made as hereinbel'ore described will operate in practice togreat advantage in lighting a street or space in front tr and extendingin lateral directions relatively to a lamp or gas burner. 1 do not claimin a reflector having two arched and tapering reflecting-surfacesarranged to reflect light in opposite directions from a flame arrangedbetween them 5 but I claim- 1. A reflector, essentially as described,conreflecting-surtaces A and B, and the plane reflecting-surfaces 0,arranged substantially as set forth.

2. A reflector, essentially as described, consisting of two concavetapering ellipsoidal or arched reflecting-surfaces, A and B, and therear plane or nearly plane reflecting-surface, D and E, arranged witheach other, substantially as described.

3. A reflector, essentially as described, consisting of the concave orarched reflectingsurfaces A and B, the plane reflecting-surface G, andthe auxiliary plane reflecting-surface D and E. arranged with eachother, and an opening, -a., substantially as set forth.

4. A reflector provided with a hole, a. atits central part, and withconcave or arched refleeting-surfaces A and B, and a planereflecting-surface, O, disposed substantially as set forth.

5. A reflector provided with abole, a, atits central part, and with twoconcave arched reflecting-surfaces, A and B, and two rear planereflecting-surlaces, D and E, arranged with each other and the saidhole, substantially as set forth.

EDWARD SAMUEL RITCHIE.

Witnesses:

it. H. EDDY,

B. PRAT'J.

sisting of the concave or ellipsoidal or arched

